galley slave gal·leys·lave uncommon noun 1. a slave condemned to row in a galley Synonymsgalley slave 2. a laborer who is obliged to do menial work Synonymsdrudgepeonnavvygalley slave Related words Word family drudge Broader terms laborerslave WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.